resilient_q...ock_slowpath(9)

👑 NAME 👑

resilient_queued_spin_lock_slowpath — bestie, this is the function that actually acquires the queued spinlock 💅

And yeah, the manual page itself is titled resilient_q...ock_slowpath(9) because someone in the Kernel API Manual department got a little ✂️ truncation-happy, but the real one is spelled out above, no cap.

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✨ SYNOPSIS ✨

int __lockfunc resilient_queued_spin_lock_slowpath (rqspinlock_t *lock ,
u32 val );

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🎀 ARGUMENTS 🎀

• lock — pointer to the queued spinlock structure 🫶 like, that's the thing you're trying to lock, obviously.
• val — the current value of the queued spinlock's 32-bit word. Yes, it's a u32. Yes, it's the value right now. Keep up bestie 🦋

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🌈 RETURN 🌈

• 0 — slay, the lock was acquired successfully 👑
• -EDEADLK — lock acquisition failed because of AA/ABBA deadlock 😭 the drama of it all.
• -ETIMEDOUT — lock acquisition failed because of a timeout 💀 it just took too long and gave up.

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🦋 DESCRIPTION 🦋

Ok so here's the whole vibe. The tuple you're looking at the entire time is (queue tail, pending bit, lock value) and it's genuinely giving main character energy:

(queue tail, pending bit, lock value)

fast     :    slow                                  :    unlock :
: uncontended  (0,0,0) -:--> (0,0,1) ------------------------------:-->
(*,*,0) :       | ^--------.------.             /  : :       v
                  |  : pending               :    (0,1,1) +--> (0,1,0)
           |  : :       | ^--'              |           |  : :       v
|           |  : uncontended           :    (n,x,y) +--> (n,0,0) --'
|  : queue               :       | ^--'                          |  : :
v                               |  : contended             :    (*,x,y)
+--> (*,0,0) ---> (*,0,1) -'  : queue               :         ^--'
:

Lowkey an art piece. Highkey a state machine. Read it, live it, love it 💖

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⭐ SEE ALSO ⭐

• Kernel file ./kernel/bpf/rqspinlock.c — go read the source if you want the full lore, iykyk 📖

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That's the whole page bestie, hope it slaps 🫶 — it's from the Kernel API Manual, coming to you courtesy of ./kernel/bpf, dated October 2026 🎀✨